tbh, 
GF Silver had me earning more SPS per win than most of Gold, and by the time I hit about 2500, I was stalling out massively - A Silver deck doesn't cut it up there, and your win rate is heavily affected. For a RF Silver deck, it might be worth it, but there's a few issues:
I rented some RF Gold cards to augment my deck - usually whatever splinter was my focus, and a 2nd, cheap one. This costs a lot and I net negative for every day and the EoS barely put me at Break Even with a single pack. The odds just don't favor you pulling out ahead.
To add to this: You lose access to all Bronze Tournaments and all Beginner/Scarred Hand Silver tournaments.
Chests were absolutely garbage - the same 0.4 SPS chests you get in Silver, the same merits - a tonnnnn more potions (which was my favorite part of the rewards - 10-15 potions per chests is nice actually.) I'll find out if the EoS chests were worth it this season - but I'm only at about 23 chests, and my EV for chests in Gold was less than 1 cent excluding potions. Maybe I have horrible luck there though. It's to the point where some days my bronze alt earned more than my gold account. But then, Bronze, Silver, Gold is the new Bronze, right?
In total, moving up to Gold probably lost me hundreds of SPS, and the stress of renting and having to pay exorbitant amounts was painful, and caused any net positive to be neutralized to a break even on playing.
There is a solution to moving up but you're probably not gunna like it: I elected for the decision to liquidate some cards and create a RF Gold Level set of Commons and Rares to start building up for Gold play on an Alt, where I won't lose my tournaments. So far, this has been a lot more manageable. This account currently can't reach very high in gold, only about 1900-2200, but it's now earning more potions for me, and earning better SPS than it would as a Silver account, this season is its first season being functional though - I still have to rent summoners for it, but I found renting just summoners, plus a few cheap core legendaries, even 1 bcx, much easier to break even on.
RE: Move to Gold league or stay in Silver league?