Yes this has been asked before but no apology needed.. It is always a good question to be refreshed every once in a while.and besides theres a good chance of a number of responses and produces good chatter... And if you think 20 is a lot you are in for a surprise. Not only do some of these guys have in the 100's to maybe even 1000's.. Like you said though you are differentiating collection and want actual rotation use.. Still with.that there will be some guys into the 100's im betting... Crazy some of the pics ive seen posted with huge collections...
Anyway myself I decided a while back to keep no more than 15 total and i think i have 8-9 in main rotationand plugging the others here and there so they get used every once in while.. Actually i just today thinned out 3 very usable razors and sent them out to Jerry (gasman) to use for the giveaways... Figure they were not getting enough love from me so hopefully someone else can use them..
Btw i just read the last half of your post and nice job on making your own SR's.. Going to try and give that a go for a winter project this coming year..
Hope there are a number of responses and some eye candy to go along with them..
Peace!! .Scott W