OK, let's go about this from the opposite direction.
Here are the TOP 5 reasons why you should NOT buy BIAB:

5) ADDICTION
First warning sign is when time away from BIAB leads to withdrawal symptoms. If friends try to engage you in conversation , but you snap back saying "GET OFF MY BACK! I DON'T HAVE TIME TO TALK TO YOU! I'VE GOT SOMETHING TO DO AT HOME", then you are hooked.

4) FAMILY DISCORD
We've gotten reports of BIAB causing family discord when the musician in the family stops communicating with the spouse, stops coming to bed at night, stops showing up at the dinner table, and stops acknowledging the kids, except to say "get off the computer... it's my turn"

3) INCREASED DEBT
Everybody knows that once you have a new musical tool, you also need all the accessories

2) UNEMPLOYMENT
After you buy BIAB it's just a matter of time before you stop showing up for work, opting to stay home and write songs 24/7. Even among those who don't quit their jobs, many fall asleep on the job and get fired because they stayed up all night finishing that original song...

and the number one reason why you shouldn't buy BIAB...

1) POTENTIAL FOR DIMINISHED PERSONAL HYGIENE
Studies have indicated that in some cases BIAB has kept its owners captivated in front of the computer for days at a time, unwilling to eat, bathe, brush their teeth, or pursue normal um, "waste elimination" procedures. No, you certainly don't want a product that makes you lose a freshness test when compared to a badger that lives in a dumpster.