Thanks for the kind words!
For me, 15mm is the perfect compromise: as you say, it saves on money, time and space, all three of which are in scant supply in my life

(although the space situation has improved since I started out). As I mainly play skirmishes, I also like having a lot of different terrain to provide variety - the storage of this in 28mm would be an utter nightmare! (It takes enough space in 15mm as it is...)
There are a couple of people who play SP in 15mm and more who play Chain of Command, which also uses singly based figures, in this size.