Teddy it can't hurt, but I'm not sure how much it will help.
The movie business is basically a "push" business and sites like inktip are "pull" technology. What I mean by that is the paradigm for the business is that writers and agents submit projects TO the production companies. A site like inktip requires that producers go to the site and seek out projects.
Most production companies (even smaller ones) are literally inundated with unsolicitied queries and submissions by agents. They have neither the time nor the need to go out on the web looking for screenplays.
And sites like inktip have no vetting process, they will post anything submitted so quality is always a concern, which is one reason that many producers don't want to waste their time with the scripts on sites like these - more often than not, they're bad.
That said, there are some producers who do so. It's usually producers with a) very little or no development money who are looking to option properties for very little or no money so they can then go out to investors. or b) producers who are seeking very specific projects (i.e. a biography of Albert Einstein or a film set in a Bulgaria because they have investors and contacts in Bulgaria.)
Almost all the producers who look for scripts on inktip are independent producers seeking to produce on a low budget (under 5 million). Many are specifically looking for non-Guild writers which often (but not always) means that upfront pay will be very low.
If you do post your work on inktip be sure to check out any producer who contacts you. Anyone can hang out a shingle and call himself a producer. Ask for their credits but also check imdb, google, etc. Also try to negotiate a short time-frame for the option. Options normally range from 6 to 18 months. If they want a 12-month or 18-month option, and they aren't paying you alot for the option - some will only want to pay you a dollar or a couple hundred dollars - offer them a shorter one with an option to renew - but if they renew they will have to pay you more money for the extension. Generally speaking, the more money someone has invested in a project the more motivated they are to make it come to fruition.
Finally, if you decide to post on intip, that does not mean you shouldn't be proactive and query agents and producers. You need to actively be seeking representation and/or a sale.
But before you post, make sure that your script is ready to go.