I've wondered if part of the reason why there is little conflict between 3P and HasTak is ultimately there isn't a huge amount of actual overlap between figures.

With some exceptions of course, 3P largely avoid making a direct competition to a HasTak figure. Yes 3P do make the same characters but they're typically different styling and cost-levels.

For example look at the CW gestalts with just about any 3P combiner. You can get the full CW/UW set for around ~$150 however that'll only be one limb and a bit on most 3P combiners. That said the 3P are typically much larger than Hasbro's offering with appropriate levels of improvements and quality.

Or PotP Primal and PE Gorira. Gorira is over double the price however the size and quality is night and day, which makes sense given the price-point difference. This goes on for so many other figures, Calibur Prime vs UT Challenger. SS/AoE Lockdown vs Peru Kill, just about any voyager/leader OP/Megatron vs the ridiculous amount of 3P offerings.

Ultimately I see 3P offering considerably more high-end figures to collectors that want more from their dollar and have the spare cash to afford it. HasTak is clearly not just marketing for high-end collectors, but to your everyday Joe Bloggs that has a lot less cash to throw around on something they'll buy just for their kids.

On a side-note, it really scrags my goat when people say HasTak don't care about collectors or they are trying to rip us off. They have a ridiculous amount of extra restrictions that 3P don't have and have a far broader audience to target.

Things do become a tad more muddled with Masterpiece since it's the 3P collector audience however the overlap here is obviously explained. With a couple exceptions, all 3P MP figures that conflict with an official release were released long before the official was announced. The ones that came after, not only came long after but also because the official one were rather controversial or felt lacking in this day and age (Grimlock, Hot Rod and Starscream).