SNG v Ring v Multi Bankroll (re: Woodguy)

[reecelights]

Question:

I noticed in Woodguy's response to Maulik's question about $10 buy-ins vs $10 satellites the following:

"Are you using your ring game roll or starting an MTT roll?"

and didn't want to respond in that post as it would have been off-topic.

It seems conventional wisdom on the Multi Forum is to use SNG or Ring profit to bankroll Multis. Woodguy's question alluded to the idea of keeping seperate rolls (which is what I currently do), so as to better track my success/failure rate across different types of games. I am a consistent winner in SNGs and am trying to increase the frequency (and ROI) on my break-even Multi Table play.

Do you think:
1. Keeping seperate rolls is necessary?
2. Should I build up my Multi Roll on its own merits, or, not be hesitant about "transferring" funds from SNG profits in that BR?

I put most of my roll into SNG play at the beginning of the year so I can play $20 and $30 tables, which I do well at, but wanted enough to keep my ROR miniscule (they are at 0.00%) with my then $2000 and now $3000 bankroll (after cashouts).

Thanks in advance for any advice and insight.