This is one of those difficult questions that nobody likes answering. I've had two 30' boats painted, and ballpark paid $5-7k for hullsides alone. Both jobs came out excellent, both shops were experienced at spraying awlcraft but were ironically both body shops that had branched out to boat work. This wasn't the yacht yard with the 50' spray booth, pretty sure they would have charged triple that.
The only thing I'll say is that in my experience paint is less durable than gel, but maintenance was much much better. I would do chine to rubrail for durability on a trailer boat. Sold my last dark blue painted boat after 6 years and it still looked almost new with minimal maintenance.
