Any drug maker must offer a regular dose form for those who need just low-doses.
There's low-dose aspirin for those who take aspirin regularly as a blood thinner. (81mg)
Then there's extra strength aspirin for those who don't take it often but use it primarily as a pain reliever, this is usually a higher but safe dose of aspirin.
Drug companies cannot go over a certain limit per dosage as per FDA which regulates these.
If a company is selling a high dosage medicine that is over the FDA limits, then you can bet your bippy that they're going to get the hammer sooner rather than later.