Was not that the point? Almost everyone have one. Hence its the most popular light. And its super cheap, great value and very flexible (flood/ zoom, AA/14500) so it represents the budget part extremely well.
Which lights would you say were more worthy alternatives to the SK68? (preferably representing similar battery size and low price)
Short version.
Both have pretty much the same diamater on the head as the HD2010. I think the reflectors are pretty much the same (someone correct me if im wrong).
ZY-T13 have two batteries in series. Electronic side switch. And a forward clicky on the back. Usually 25$ (but many have bought them cheaper on various sales from Wallbuys). Resistor mod can easily bump it up to 3A to the emitter. Stock is about 2A.
ZY-T08 have two batteries in parallel. Reverse clicky on the back. I believe its usually 2 amps to the emitter. More popular to mod since it can use every type of driver out there. Resistor mod can also be done. Stock tailcap readings are usually slightly above 2 amps, but can be higher… About 25$.
Here is a nice review of the one FT sell, you can also see it compared to HD2010 in size.
There are lots of reviews of that light!