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If you have a game group where every member is likely to wanna try their hand at running a game then your analogy works - but I submit that many game groups don't work that way.
##I agree most groups do not run that way. What I was getting at is more if you wanted to play a class from the other books at a table where the GM only has 1 core book then buying the other core should be your responsibility not the GMS.##
Running a game isn't like playing in one, and not everybody at the table has the chops to run a successful game. Some do but won't run anyway because it's a lot of work and they just don't wanna invest the time. For such folk, one or two books is all they'll ever buy
# and all they need to those people will probably be more likely to stick with 1 core and maybe a supplement for their class making the multi core discussion invalid for them##
and with the proliferation at the gaming table both of electronics and the proliferation of free online dice rollers for FFG's system, most really don't need to worry about paying for dice.
## fair enough but not all have moved with the tech, our groups dislike rollers to discorage certain behaviors##
It's also been my experience that game groups where every single player will bother to buy any of the books in the game at all are also not that common. I have run games for groups for years where I was the only one who had a copy of the rules, such that I often had to buy multiple copies, one for me, and another as a "table copy". That means that there's a lot of borrowing going on and reading over people's shoulders because it's been my experience that - particularly when we get older - gamers do their gaming when they do their gaming, not before and not after. Why should they buy a copy of the rules if they're never gonna read them because they're too busy?
## because of how we play this happens a lot with us as well. We run 6 weeks of a game and swap GMs and systems going back to the game when that GMs turn comes around again. This again comes down to choice when running...if you want things from a Core I do not have then you buy the book if I don't want it. If not use what I have.##
So under those circumstances really it becomes the guy who's always running who introduces a player to a new system - not the LGS. So how many books and how much space taken up on the shelves and whether or not there's a box set becomes less of a turning point for decision.
## I disagree here game stores cannot stock everything. So unless you do all your game shopping online then you need your FLGS to stock it. Stocking 2 products instead of one will affect their profits in and industry that does not have a lot of margin.##
I know there are still people who like everything in one book, but, imagine how honked off you'd be if every single GURPS book was printed with the basic rules in it. Could you imagine that? Gurps has...what...**** near 100 Supps out, maybe more? How long would Gurps fans put up with paying extra for rules they already have?
## But you can play with just the GURPS rulebook! If you take the core rules out and sell then separate then things need to be playable from out of that book. That meen you need to add races, specialisations and equipment.......so basically the beta books.##
You might not like the idea of a separate core document for the mechanics but I would bet my **** spleen you'd like to see the basic rules reprinted in every supplement even less.
## but I have not been saying that what I have been saying is that a CRB needs to be playable from first purchase.##
Even if you only ever bought five or six...you'd very quickly ask yourself just what the hell there needed to be basic rules in with the Space Atlases for anyhow?