Lots of threads on scope quality and their relevance, a search will provide hours of reading.
For some, a "lower" end scope will suffice. Especially if you're shooting at known ranges, don't rely much on accurate tracking, and IF the scope holds zero well, there's no problem.
I have this "Midway" BSA scope on a long range 7mm.-08 and shoot it at 565 yards- it holds zero perfectly, and tracks "OK". The knobs are mushy, eye relief sucks, but it gets the job done. I bought it based on all the positive reviews and it works for the money.
http://www.midwayusa.com/product/962...-reticle-matte
Bottom line is, buy as much scope as you can afford and you'll never be disappointed.