Massive coils don't 'Increase' the temperature per sé, what they do accomplish though is heat dissipation.
For example, a coil with 30 watts and a set surface area, compared to the same 30 watts on beefier wire covering twice the wick. The results will be the same in terms of total power input and output, however the beefier wire will dissipate the heat across a massive surface area meaning the Heat Flux (Measurement of power/surface area) will decrease.
Does this mean they're bad? At first, I thought so as they're horribly inefficient compared to thinner wires. however there's a few things going on here.
Firstly, your internal wick diameter has increased, giving you much more core/reserve wick in the centre of the coil. This means that if you've reached the burn point for a certain build at a certain wattage, you can bet your ass this will allow you to eat up more wattage without burning.
Secondly, with the extra reserve wicking available, and also more surface area of the wire/coil, flavour should become noticably cooler, yet the two-fold effect of more surface area is literally more juice being vaporized, so whilst it cools down, its intensity does increase!
Lastly, there will be a considerable difference in ramp up time for a larger diameter build at the same wattage. This can be negated by increasing the wattage to compensate (This is where it shows its inefficiency)
But in terms of pushing the limits, they're BLEEDIN' GREAT! Big Grin
(Says he, who's never truly vaped above 50w) But hey, the theory is all there!