Roulette's might be what you want to focus on some more. Should get you enough seals to keep up your venture coins to send your retainer's out on a constant basis. Also, if you craft, you can just make your own glamour prisms as needed. But that requires a high level crafter in each category you want, so that's not a quick fix by any means.

I consistently send my money so I've not gotten above 500k. But I also make about 50k-100k a day via my retainers selling items (I always have them selling 20 items on the MB and cycle through their prices constantly to ensure I'm selling quickly). I just buy things way too often. Doesn't help that I'm the lone gardener for my FC. We went through 100 krakka roots in about 3 days T_T I wish soil was easier to get, because they're expensive