Sure, I don't mind. The average price for a doujin here is 20 pesos each. Only the front is colored. However, I've seen some people sell their doujins for 70 pesos each - all pages are probably colored. You can also offer to draw for people, or sell your drawings - those who draw will charge at least 30 pesos per drawing, fee can be higher if the drawing is colored. Bookmarks go for 20-30 pesos.