Sure, but on the other hand, why would people pay to do "a job" for a company? It should be the other way around, no? 
People who pay 150$ they will want some enjoyment out of it and not to "have a job to do" (or they will be investing purely to be the first to experience the content and learn as much as possible to get an edge), so they are more likely to spend time exploring the game "for themselves" and not "for the studio" to fix bugs.
In the end, the sum of money that a player pays for a package doesn't really affect how extensively someone will activate himself to help the company to fix bugs. Imho, if by some small extent someone will, he will due to the fact that company let him play alpha / beta for free (or cheap) so he will be grateful, and not the other way around (pay large sum of money to do a job for someone else).
The price of the early access, should in fact (imo) have a completely different purpose. It should be to tailor how many of players dev studio wants to include in which stage of pre-release testing.
So a studio says (example numbers) ok for an alpha one we want 300 testers, for alpha 2 we want 1000 testers, and for beta 1 we want 3000,...
Then studio calculates how much to set the price for each package, anticipating how many players will buy such package so they get numbers they wish.
And then they include early access reward to specific packages, depending on this price calculation. That's basically it.
Who will help the company more, or less with fixing bugs, that has little to do with the money (again imo).