#1
To mod my MIM tele? Pups, locking tuners,straplocks, etc? I like the way it plays. I was just wondering if it was worth upgrading some of the parts on it.
Gear:

Epiphone Les Paul
Vox AC4
Ibanez Tube Screamer
#2
if its cheaper than buying a new guitar and you like the one you already have, i would say so
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#3
If you like your tone already, I don't see why you would need to upgrade your pups. Locking tuners and strap locks are more of a convenience upgrade. I'd say worth it. I put straplocks on my Schecter a couple weeks ago, for like less than $10.00 I'd say it's worth it.
Amps
Mesa Dual Recto 3 Ch
Peavey 6505 Combo

Cab
ENGL E212VH Cab

Guitars
Epi Explorer
Schecter Damien 6
Squier Strat (signed by Rob Zombie!)

Pedals
ISP Decimator
Dunlop Crybaby Original
Boss CE-5 Chorus Ensenble
Boss GE-7 Equalizer