Not a stocking dealer, but an FFL for over 40yrs and have worked in a couple different LGShops during that time too.

Take all the transfers that want to walk in and hand over cash $$ to you.

Hike the price a little if it makes you feel better, but don't turn away business of any kind as long as it's legal.

$25 is very cheap for a transfer these days. Check around your area and see if you aren't under pricing yourself.
If you don't want the x-fer business, hike the fee out of sight.
If you do, and you are under priced in that area, up the rate to be more in line.
It's not a hobby, you're in business.

Remember, Shops dry up and and disappear from one thing,,lack of business/customers.
Transfer customers are just that,,customers with money in their hands.
Some days it may be the only cash you take in.
Other times, a transfer customer may take a liking to something you have on the shelf and you make out twice.
That's business.

JMHO