By the time you buy a keggle, a burner, a gas supply, a 50l esky etc you could just about go 2 urns and do parallel BIAB batches with very little extra effort, and can even do side by sides with slightly different ingredients if you like experimenting.
Edit: Most of a brew day consists of sitting around waiting for things to happen (90min mash 90 min boil) with mad bursts of manic activity, so by starting a second brew 20 minutes later than the first one, you end up with more manic activity, but only add 20 mins to the brew day itself. Give me the manic
Edit: Most of a brew day consists of sitting around waiting for things to happen (90min mash 90 min boil) with mad bursts of manic activity, so by starting a second brew 20 minutes later than the first one, you end up with more manic activity, but only add 20 mins to the brew day itself. Give me the manic