"Why bother to sue when you can use the UDRP which is a lot cheaper (about $1,500 per claim and can include multiple domains) and it's a lot quicker too (takes about a month from start to finish)?"
Because they gain nothing financially nor is it as intimidating, it costs the defender a lot less too, so they might actually be able to fight it and not run at the mention of litigation.
But isn't the normal list of proceedures as follows?
- Hosting provider take down request
- UDRP request
- Done.