Isoacoustics overweight

My understanding is that all Isoacoustics products work most effectively when the weight they're carrying is right in the middle of their stated operational range.  These ranges overlap, so for optimum performance you probably need to step up to 1.

See the reviews of people who have gone from Gaia to Townshend. You can use Pods if you want to save some money but if you use Podiums the improvement will be a lot more. Yes they are expensive but compare the results. Everyone going from Gaia to Podiums saying it is well worth the extra. My 150lb Moabs are on Podiums. Not just improved. Transformed.

The OP was enquiring about Isoacoustics GAIA...and Not about a totally different manufacturers product that you seem intent of promoting !

Without knowing too much about the gaias, it seems like they work like a shock absorber or even springs on a car in terms of downward pressure the weight places on them. So, imagine you have a small set of springs and put a medium to large dump truck on them. They may or may not hold up the truck, but it may not be a smooth ride along bumps or steering etc... 
That is how I view the gaias and their weight capacity. I got the #2 just to be safe, although I was tempted to get the lighter capacity ones. 
It's not about breaking or holding up the speakers, but the footers doing their job in a capable way, instead of being overwhelmed by the weight.

From their website:

The GAIA model should be selected based on the weight that they are supporting. The weight limits we set are based on the performance curve. The GAIA perform well up to the specified weight limits, but once you are within 10% of the weight limit, we recommend using the next size up for best results. We do not recommend exceeding the weight limits of the GAIA’s or GAIA-TITAN’s.