as it turns out: I'm lazy!-/ And there's no such thing as "free Data"!
But I'm posting some raw numbers and let you draw your own conclusions (if there's somebody reading this anyway)
I've been mining with roughly 65TB on burst.ninja and burst.lexitoshi.uk. Seven days each.
On ninja the miner won 16 Blocks and earned a Total of 36931.15773125 Burst (40235 Burst if solo)
on lexitoshi it won 15 Blocks and earned a Total of 32733.91999977 Burst ( 37722 Burst if solo)
This Data might be missing a bit because it was pulled from burstcoin.biz. And those logs are spotty but only very little!
On ninja my jminer got a lot of "not confirmed dl's" at first until I realized I was polling to fast. Turning "refreshInterval" back up to over 1000ms made made it better but still not good. So I switched to Blago's miner where still got the occasional "error 1007"!? (no idea (°_°;))
On lexitoshi I get non of this.