I know this wasn't directed at me, but I'll give an answer.
I've always bet in Units 1-5 (5 being the max number on any one game or bet). In theory 1 Unit should be 1% of your Sports Betting Bankroll and 5% is the most you'd ever risk (on what you thought is a "lock"), however since I do not have a seperate Sports Betting bankroll I just bet what Im comfortable with, with each Unit being $100.
The more confident I am the more units I'll put on my bet. In general the majority of my bets are 1 Unit Plays. The other week I had more than 1 multi unit bet in the same week which was rare for me (3 Units on the Mets for the Series vs LA and 2 Units for the OVER in the Valuev vs Barrett fight.) This past week I put 2 Units on Michigan (who barely covered
) 1 Unit on Pittsburgh (panthers not steelers) 1 Unit on Ohio State (who hoo!), 1 Unit the Eagles (who screwed me and my vig was bigger than usual too!) and 1/2 Unit on the Jets (who almost choked
). This is more like what a typical week looks like for me.
As far as 4 and 5 Unit plays, I can probably count the ones I've placed on 1 hand.
Last college football season I placed two 5 Unit plays in the same week. V. Tech over Virginia (I think the spread was -7 and they won by 35 or so) and Penn State -8 over (I cant remember) but that covered as well. I placed a 4 Unit bet on Wisconsin in the first round of the NCAA tourny this past year.... oh and the Broncos last NFL season were -3 over the Raiders and I put 4 Units on that. There may be one or two Im forgetting, but I like to think of picks as pretty big locks if I put 4 or 5 units on them. Like I said before in general, its mostly 1 Unit Plays and mabe a 2 Unit play as well.... 3 are uncommon, 4 and 5 are rare