I literally try to perfect High Level Chapter scenes so this way I would earn silver like crazy. Forget about the Collections for now--they just waste your time and drive your attention away from using a Chapter 16 or Chapter 17 scene just for extra Silver. If you can get a respective score (550K or so), then you can hoard up to 3500 Silver in just that scene alone (but don't expect to earn as much silver on the Paradox Scenes, though), PLUS you can earn about 1300XP per play, so if you had 60 Energy Points (Each scene costs 10 Energy to play), it's an easy 21K Silver and 7800 XP. If you play it right, you shouldn't have to worry about running out of silver unless you're in an extreme Garden Makeover.
I'm just an ordinary user, like you. I'm not an expert, but I'd be willing to help...