Number 1 item of advice - if you want to control a machine addiction - GET OFF THIS BOARD!!! You'll be hard pressed to find a more dedicated group of enablers!
#2 Try to be firm and stay with Singers. I didn't fall off the deep end until I ventured away from Singers. I was really good for a while, and then my husband found the Two Spool . . . and then I fell in love with a machine on Craigslist - and the New Queen came home with me. Then those two felt lonely being the only non-singers. So they started sending out vibes to get me looking for more. Maybe if I had not had them both in the bedroom, they would not have had such control . . . no I have twice as many non-Singers as Singers.
I also fell in love with Singer cabinets - machines take up enough room, but collecting cabinets is overboard.