PhotoPost Pro has one primary developer (me) and that has worked well for us for 7 years or so. Zach is very active in coding for vBGallery and always looking into new ideas; I don't see adding programmers as a "need" at this point.
PhotoPost vBGallery is one of several products we offer; granted the similarities to the Pro version make marketing them side by side difficult, we've never tried to kill off the product in any way. We've continued to support the product, improved it and I see no reason why that wouldn't continue as vBulletin updates it's products.
Just as Brian worked on his products part-time, vBGallery is not a full time job for Zach. Monies are paid to support the products generally go for that purpose; but it's not a 1 for 1 kind of thing as there are more than development costs in running a company such as ours.
Please do not PM me for support or sales questions. Thank you for your understanding.