More customisability and ability of players to personalise their planet is generally a good thing and to be encouraged, however i feel that too many of the messages would simply be abuse and/or vulgar. it would be quite annoying for MH to sort through 1000 graffiti messages a day (especially if it costs money to be removed - "if i am offended by it why should i have to pay to have it removed?!" etc) when they could be using that time for more useful things (like idling
).
So whilst i dont think that this is the best idea for that reason, i do like the lateral thinking
.