Is value for money for the mg/mL your main reason?.
Im curious about the blends. High concentrations also get a bad rep for pip as well. Possibly more solvents?
Might try it sometime.
HC gear is usually better IMO.
Lets say you buy from China some T500.
China uses crap oil, its a blend of food grade veg oil, mct and EO.
It has more solvents and less of that crap oil.
You buy US Pharma MCT oil, 20 bucks gets you a 50ml vial.
This is very high quality.
1ml syringe, you mix it 50:50 to get T250.
Your T250 now has 1/2 high quality pharma grade oil, 1/2 of the solvents and the rest is crap oil.
If you buy T250 from China, you get less solvents, and alot of that crap oil.
T500 is cheaper too, uses less space, less amount to filter.
Higher quality T250, at a lower price.
And if you can tolerate something like T300 or T350, then you can even pin less volume.