Just to expand a bit on the LBA acronym:
A number of years ago on DPR (thats dpreview.com by the way
) Lance B - still around and posting and has even been seen here at pentaxforums
- coined the term LBA. There is some debate as to whether it stands for Lens Buying Addiction or Lens Buyers Anonymous but they both work.
Pentax is a perfect brand to carry this disease as pentax glass is legendary and most importantly STILL IN USE on their dSLR cameras (unlike other brands). This makes classic pentax lenses still in demand and many cannot help themselves. One symptom apparently is the owning of more than 2 50mm lenses
Lately the term has even shown up in official Pentax Corporate websites and marketing (eg. "Feed your LBA")
There are more generic terms around like GAS (Gear Aquisition Syndrome) found among - but not limited to guitar players, but LBA is a true Pentax term. Hence the bumper stickers.