The lack of available shops is the whole point.

It’s not a good idea to allow people who are inexperienced with the server economy to have the ability to significantly change it. Having a very limited number of shops is a good way to do this. Getting shops in a good area is extremely expensive (buying my /shop2 shop cost me £10k in-game). This means only people who are very familiar with the economy have control of it.

I personally believe the current amount of shops is pretty good, and doesn’t need changing.