In order for someone to make their livelihood painting warhammer figurines, they would have to have achieved a certain painting skill in order for the models to sell for the level that would account for their time and effort. For instance, 80 dollars for a fully assembled and painted master of the ravenwing may seem like a lot, but that guy costs 56 dollars, meaning that the painter is only being paid 24 dollars for all of his time assembling and painting it. Unless he was able to do it in 3 hours, he would be making less than the $8/hour minimum wage in Canada, which is what our government determines the minimum possible wage that someone can make and achieve a reasonable standard of living.
Therefore, someone who is not able to paint to a standard that allows their models to fetch a high enough price to pay for the cost of their time, it is not reasonable to assume that they are a professional painter, as there is no way that they could possible make a living doing so.
/rant