Does it make sense to turn to SEO freelancers with the goal of website promotion

What you need to do: make a vehicle or a promotion?
If a promotion, then why do you have a strategy of buying articles? If your website needs to earn money, and measure the result we need the money(received) and not in the purchased articles.
Decide what result you want to achieve and how you will measure. If the optimizer tells you: "I'll buy n papers and m links, populus here and there, etc.", you answer that you are interested in tenth place, let him say how much it will be in your RUB(if you know how much you bring targeted visitor). If he strongly resists attempts at the language to speak, it is better with him not to have it.

Why not, if one understands this, not just "Yes, I progeny 100,500 directories, Yes, in Sapa will throw 300 links and all will be the result"
Will get the money for the bait will roll.
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You can find out what he is doing, also ask for every day analysis of the results. how much is spent on what...

if you have the budget to order in a normal company, it is not necessary. But otherwise, there is no escape — and it is better to act only in the opinion of friends, to contact proven in any way yourself

It is very hard to assess the work Ionica. What are you going to navigate? On puzomerki? The increase in attendance? To increase the number of clients? The problem is that any visible effect may be temporary. You will pay to the freelancer and he will leave.
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I would suggest, oddly enough, TK for optimization of website to make. Let it will take time to study the necessary information. And then, when you have a clear plan for website promotion is to find the right contractor-a freelancer that will perform.

SEO specificna. It plays in Black Box Turinga. Imagine changing world of search algorithms, which, moreover, are tightly closed to the outside.
What would you do — have to work at random. Here statistics helps — the presence of an increasing amount of scattered information about different methodof promotion.
One employee more or less efficiently pulls 5-8 projects. Ie freelancer sampling sites 5-8 + feedback from peers on forums and community.
Have a SEO-company — between 50 and 800 projects, this is a representative sample.
With subsidence of the separate sites after update quite quickly becomes clear how to act.
Another downside of freelance is the lack of a closed automated software — that affects when working on a huge semantic kernels (more than 200 saprosma on the website).
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And online stores can be up to 10 000 different queries (nizkochastotnoi) for the project!
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Additional risks — the disappearance of the freelancer. All of the above relates to SEOs in the company, and to the little young SEO companies. + add the cost of your time that you spend on communication with the private master.
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Conclusions: if you have a small SEM.the core of the low competition in your market, you are young and you have enough money — you can take the risk and hire an employee or freelancer for promotion. But, maybe you should try yourself? It's not so scary.
In other cases, it is not a calculated risk.

I would have concluded the contract on traffic.
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Ie doesn't interest me where and what articles/links to buy/place a freelancer.
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1. Record number of visitors from search engines for relevant queries at the moment over a period of time (e.g. week/month).
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2. Fix it, but after the work of a freelancer
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3. Paid the difference (N-RUB for each additional guest).

find through freelance.ru one standing adequate man with a good rating and work constantly with him. And the forums do 90% of the proposals in the style of "banish your website on the millliona of govnosaytov"