Or, if possible, just make gralats unable to be locked on bushes. But I think it's probably an all-or-none type of system when it comes to being able to lock gralats.

It used to be that you couldn't lock gralats at all. People "charged" bombs (Hurl ten bombs over my fence into yon grass to see ye ol codeshoppe).
It was horrendous... but maybe we've progressed past that?

The other thing is that vases can be used in order to force bombing of grass.

It would certainly eliminate the problem by a lot, and the old bomb payment method that you mentioned means owners can't advertise their houses as public ally anymore.

Vases are a problem but I've noticed forced bomb farming is a huge turnoff to a lot of players when they enter a house.

Just reported the top 5 houses will report back if anything happens.

It was all about scams. People would stand there saying that you had to drop 10 bombs or how many ever in their farm... basically 'farm for me and I'll come let you into my house.'

Then they would either never go and let the poor noobies in their house or else they would just have nothing inside and laugh all the way to the bank. Time consuming, yes. Preventative, not so much.