How to tell if you have problem (10 possible responses) . . drum roll please:
1) if you could sell your lenses and put a down payment on a house, you are "heavily invested in glass."
2) if you choose glass over food as a monthly expense you are "heavily invested in glass."
3) if you think there is a US Recommended Daily Allowance of Thorium, you are "heavily invested in glass."
4) if someone asks you how many lenses you own and your answer is "I don't really know, " or "it depends" . . . you are "heavily invested in glass."
5) If you have ever had to build furniture or move houses to accommodate your lens collection, you are "heavily invested in glass."
6) If you think Berkshire-Hathaway is a junky stock because it doesn't own any lenses, you may or may not be "heavily invested in glass," but you definitely have a problem.
7) if you refer to lenses as "glass," you are probably "heavily invested in glass."
8) If you have ever rented an exotic lens from Lensrental.com rather than just purchasing the darn thing, you might not be "heavily invested in glass," but if you then turn around and offer to purchase your rental unit you probably are.
9) if you tell your spouse/partner/lover/dog that you can stop buying lenses any time you want to, you are are "heavily invested in glass."
10) if you think the world cares what lens your picture was taken with, you probably are just an average RFF member. We are nuts. We know it. And I couldn't tell you how many lenses I own. . .
typed while grinning,
Ben
[Edit: if you think it isn't worth selling your Pentax screw-mount lenses, your Hexanons, or Sears-branded wide angle because the paltry sum you would realize is not worth doing without these classic over-achievers you are probably (sigh) "heavily invested in glass." And I can stop ANY time I want to. 😉 ]