Seeing as I have absolutely no showdown value here and both villains have shown incredible weakness, is this river bet +EV?

$0.25/$0.5 No Limit Holdem
6 players
Converted at

Stacks:
UTG ($61.65)
UTG+1 ($47.70)
CO ($61.15)
Hero ($50.00)
SB ($59.75)
BB ($31.55)

Pre-flop: ($0.75, 6 players) Hero is BTN [7h]
2 folds, CO raises to $1.75, Hero raises to $6, 1 fold, BB calls $5.5, CO calls $4.25

Flop: [Qs][Jc] ($18.25, 3 players)
BB checks, CO checks, Hero checks

Turn: ($18.25, 3 players)
BB checks, CO checks, Hero checks

River: ($18.25, 3 players)
BB checks, CO checks, Hero bets $11

terrible...I'll call you with A high there.

Well...to be fair, I think Sem is probably right that there's not much point in doing it yet. You'll tend to do better at 50NL not trying those plays...you can START at 100NL, but even then you don't need to...at 200NL, those plays start to work enough that you should definitely have them in your arsenal, but again, you don't 'need' to. I recommend it, but the learning curve will be there and you have to be really careful.