38 (35-3) Multi-tabling on Bodog question

One more question (I just posted below).....and again, I haven't seen this answered anywhere. I'm thinking about multi-tabling on Bodog. I play so far in only 35-3 6 person SNG's on Bodog. My ROI through 160 games is 39.5%. What kind of "hit" to my ROI can I expect if I decide to multi-table. Also, I would only play 2 tournaments at once (I think any more would make my head explode).

Thanks