Absolutley, it's fair risk. Frankly too, if you're doing your own mods, then you've got a good chance to ebay and repair your own things, or at least would be happy to take it to a trusted phone repairer.
A smartphone is one of the few things in the world which is starting to really stop being component based, and you can't really treat them as modular like a car or computer. It's hard to say 'oh well that's the manufacturers fault' if you can't turn it on, because is it the screen or is it a bootloader problem? Did you do something horribly wrong?
If the onus of proof is on the consumer to prove it wasn't his modifications which caused the problem, then it's suddenly very hard for that owner to prove the problem was hardware not firmware or software if only due to the integrated and tiny nature of the device. Because you can't just pull the suspected broken bit out and test it elsewhere, and prove it's the broken part, it's hard to prove that it's a manufacturing problem.
I buy a new phone (or a new car) for the warranty. This idea sucks.
This is the screen that displays ONLY WHEN YOU MODIFY THE BOOTLOADER.
If you do not modify the bootloader (the bit you have to modify to get root, which then enables you to get custom roms, and other fancies) then you have full manufacturer warranty.
I think you're trolling, but because your name is infi i can't be sure if trolling or...
edit: as an aside pinky your link is broken