Well for the The Ultimate Hobby Shop.
I'm lucky to have 5 in my hood.
To stay in business, you most appease all hobbyist.
One I go to (Bridgetown hobbies, formally known as Military corner))has no trains but lots of cars, Military, sci-fi, and Games (really?)
they have been in business for well over 30 (I've been going there for 20) years.
The other one (Tammies Hobbies)does R/C, Trains, Military and model cars and is also well stocked but there prices have been climbing lately.
But They specialise in Trains and R/C are first on their list and models as extra $$.
Another one (Vic's Hobbies) does only Trains and diorama supplies, good for supplies (plasti-struct/evergreen)and glue.
Model builders are like Zukist people,
Cheap..
we want bang for our buck!!
That maybe only my Opinion but I doubt it. ha ha..
So I'd suggest a Hobby shop Like Tammie's but lean more towards models with R/Cs, games, and trains thrown in for extra $$