@Cris_Pap your suggestion is basically what a Bounty is used for.
A bounty allows the community to allocate funds for a specific kind of project, which doesn’t have an owner, and allows curators to find the best candidate to execute that project in whatever ways they want to evaluate.
The problem with your suggestion being an open bidding system, is that there is no way to know when a bid is actually from a qualified candidate, or just a random person. If the lowest bid wins, some troll will just place a bid for 1 DOT, with no intention to do the project, and take the project away from people who would actually get something done.
Also, I would argue the cheapest solution is often NOT the best solution for the treasury. We often want to balance budget with quality, so you can see how a bounty system with qualified curators who can make that judgement will be better for this kind of thing.
For this, we simply need to be more conservative with the kind of spending we do with unknown actors. People coming to the treasury for the first time should only get small proposals passed, whereas those with a history of high quality contributions can actually start to receive bigger or more speculative projects.