You already know this, but same here. It's a toss up though because browsing is cheaper this way if you're going to light mobile sites (I can use 0.8 units over a couple minutes rather than 1.5-2.0 units on older TracFones), but MMS is just insanely expensive.
Castrol EDGE 5W-30 is my drug of choice.
Primary: iPhone 6 64GB, Galaxy Note 3, Lumia 635: 5 lines, 1x $15 5GB data, 2x $5 Android web, 1x $2.99 T-Zones, corp discount + $10/mo loyalty discount = $93/mo tax inclusive
Secondary: iPhone 4S & LG Ultimate 2: TracFone (Verizon)
Tablet: iPad Mini Retina w/ T-Mobile 4G LTE