I use PLR all the time, but mostly for supplemental material. I created a whole membership site using PLR material from a PLR membership I belonged to so I didn't have to pay on a per piece basis. Ended up investing about $100 total and sold the site in the five figure range! If you slice and dice and present in a good way, there's a lot of value.
Besides the above example, I only tend to use higher end, more expensive PLR content that has a limited distribution. I just picked up a package the other day for $30 and it's killer stuff...using it as supplemental material for an upcoming product I am doing.
But when using PLR, just be careful...a lot of the stuff out there is rubbish and you don't want to give your customers/followers/prospects rubbish! So always be sure to put work into making the PLR stuff look good and present well!