I just struggle with the term semi-pro. Do semi pros pay tax? Do semi pros have liability insurance?
I've never heard of an amatuer doctor who does a little bit of paid surgery here and there when asked.
Or an enthusiast accountant who will do a passable job for a knock down rate.
Right, but nowadays everyone with a camera-phone is a photographer (see social pages) and everyone who has 1 good photo is a model
People buy a cheap dslr with kit lens and next day they are "Photographers". Same with people with money. Buying expensive gear won't give them skills no matter how many 1Dx or Mk3s they have.
I like the idea of the: What if your doc or mechanic would be like that?
-Well. Mrs Smith let's remove that nasty..
-No, I don't have a scalpel and I wouldn't know how to use it anyway but I have a Gerber and my friends say I'm very good with it... Now hold still, it's not too sharp in the corners and we only have available light...
Sorry for the detour..
To the OP.
I would do a check on what the others in the area are charging. If they are better and you only start, charge a bit less. If they like your work they will pay anyway. If you are better than them and you only start charge the same and point out the excellent quality and added value they will receive. I understand the exposure thingy.
It's nice but if they like your work that should be rather a plus not a substitute for payment.