It's more expensive than getting a patent, which you can do yourself.
Courts have procedures, and it many juris dictions, they require you to be represented by an attorney. While I'm not an attorney, I've been the the process enough to know a few of the steps:
1) demand letter(s) and responses
2) negotiations, w/o a mediator
3) drafting and filing of the complaint
4) motions w/ responses
5) negotiations w/ a mediator
6) interrogatories
7) discovery
8) depositions
9) pre-trial hearings / more motions
10) presiding judge led mediation (sometimes the judge wants to give it a shot)
11) trial
The entire process can take years - especially when one party is on a tight budget (dragging it out can be strategic).
So, there are quite a lot of steps and in the US, very few statuettes allow for legal fee recovery, so it might not be available.