Sorry, I don't agree with Tom or Pbrad. AwareIm have 3 agendas which they advertise on their website.
1 Sell a development Tool
2.Sell their services by developing an application
3.Develop plug-ins etc etc
So to think an increase in sales of anyone of the above is going to affect the development of the core product or take over their development roadmap is just plain crazy and even laughable.
They know exactly what they are doing and if they were to stress on the increase in workload I am sure they would employ more staff.
I am sure a lot of the main features in AwareIm have come from paid developments anyway.
Paid developments ensure a very rich and diverse product and most often other users score big time because they get them for free.
If you are a mainstream developer, the only way of survival is to pay for the feature you need to be added so you can get your product up and get paid.
Wish lists don't really work that well.
So I definitely vote yes for this concept and think its a good idea to participate in some kind of pitching in way.
I have had some success with this concept in the past, but very often find what I may think is a great feature others might not so you end up paying for it anyway.