Now this is my kind of thread!
I am a chilli addict, no two ways about it. I've loved hot food since I was a kid, even though the family didn't so I couldn't have it too often. Dad was a wimp, and my Mum and brother can handle a bit, but not much. I do remember hearing that my grandad developed a taste for heat when he was serving with the RAF in North Africa though, so perhaps I got it from him. Indian food is really popular in Britain, so my friend and I went on a little tour to sample the so-called hottest curries in the country. I basically laughed them all off but my mate was caught out by one in Edinburgh and had to go to hospital (the baby!)
As far as chilli (or hot) sauces are concerned, I'm not a big fan. Some of them can reach pretty decent heat levels but I've found that they are almost universally disappointing when it comes to flavour. This is why I grow my own chilli peppers and make my own sauces. I have grown the bhut jolokia, naga jolokia and the naga viper in the past and am currently growing the Trinidad Scorpion, although it doesn't seem to like the British climate much, even when grown indoors. I also grow milder varieties, but since the topic is heat I won't bother to mention them. Out of these I make all different kinds of sauces, from fruity to barbecuey (is that a word?) to the ultra hot. I'm currently looking for a pepper that is in the genus capsicum chinense but without the distinctive habanero-y flavour to it, more like the common capsicum frutescens species, so any suggestions would be very welcome.
One thing that annoys me about liking really hot food, or more accurately, telling other people about liking really hot food, is their insistance that "You can't possibly taste that with so musch chilli in it"! No. Maybe you can't. I can. I've even found the capsaicin in chillies to accentuate certain flavours. Cumin and corriander are two such flavours, and that, I think, explains why they are so often used in conjunction with chillies. But, like so many other areas in life, some people will stubbornly refuse to believe that other people could possibly experience the world differently to them. Ah, well...
Incidentally, the OP stated that 16,000,000,000 SHU (Scoville heat units) is the hottest currently available. While this is accurate, it should also be said that it is the hottest that will ever be available, as pure capsaicin is rated at 16m SHU. I've never heard of this Intefera-thingy-toxin, though. I'd guess it was a capsaicin anologue, but whether it's synthetic or naturally occuring I have no idea.