You are welcome! I think to answer your question, people are brand loyal and feel like the generic is not as good.
I was like you, could not justify a gun for $50 when there was one for half that price!
This past year, Scotch made a pink one targeted at scrapbookers. You can get it for 50% off at Mikes with a coupon, so it is MUCH more affordable. The tape though...I prefer Tape Depot's over the ATG Scotch brand, but that is just me. It is also cheaper. I buy 12 rolls at once.
Even with the almost equal prices now, I still prefer my generic gun for the reasons I stated in my blog post. It just fits my hand better and I feel I get better control.
Good luck in your search!