i have bought plenty from LMC, but also all of the other catalog houses that everyone knows about and uses. LMC is rarely the cheapest. But I find myself doing research on their site which has nice exploded-view pictorials and it is always easy to find the part i need - sometimes i don't know the name of the part i am looking for.
someone at LMC developed that site, wrote the code, set up the layout and links, etc. And it surely wasn't free. So from time to time I purchase from them to support their enterprise. they have made my restoration easier by publishing the information that they do - if no-one buys from them they will of course go belly-up and we all lose a resource.
my 2-cents anyway...