Well..a few..
one will come along and tell you how it used to be done back in the day..
there will be one who says it will work better with an add on module..
there will be quite a few, that will say it must be the newest most electronic mercury model or it will never be right!!
there will be a few that insist that it needs an o-ring on it..
DONT even mention cost, there will be once that say it is only woth 2 1/2 cents, then someone will come along and say they are worth 3.75 cents, or maybe even 4 cents..
there will be a few that insist, that there is only 2 years of production that are worth having..
there will be someone comes along and asks, what is meant by incandescent bulb?
one will come along that has managed to scew up the threads on the base...
.. anf one that has one stuck that they cannot get out..
There will be at least one that has leaks, even though that is hard to imagine..
a few will want to make it brighter or better even though it is working fine
there will be at least one that bought the bulb used but NEVER gets it to work right...
as you can see, it takes quite a few, & there is more...
.. but its all good...