I liked the purity of quarks character. Always after whatever provided the most opportunity and profit. He frequently was thwarted in his shady dealings in the pursuit of profit, but that's capitalism baby!

Not to imply I'm a fan of capitalism, far from it, but he was portrayed so perfectly as the embodiment of pure, unfettered capitalism. Regulations were little more than a suggestion and if breaking them didn't result in a loss (of profits), or if it had a fairly low chance of affecting his profits, in his mind, then he would simply ignore rules and do whatever the hell he wanted.

Looking at the world today, that's exactly what capitalism is doing. If you have laws but no enforcement, corpos will do it because the punishment is basically non-existent. If you have laws and enforcement, but they can hide/relocate/obfuscate that they've broken any of those laws, then they'll do whatever they damn well please, and just hide it. If the punishment for the infraction is less than the profit to be made by ignoring the laws, they'll do that too.

One notable example I like to go back to frequently is relating to tobacco. The laws are there but enforcement is stretched so thin that the chances that you'll be caught are pretty minimal. So many places, like corner stores and gas stations, don't give enough of a shit to enforce the laws. They make so much from just selling to whomever asks regardless of how old they look and whether they have ID or not (within reason, I don't think anyone is selling to 10 year olds), they'll just do it anyways. When/if they catch a fine for it, they'll easily pay for it with all the profit made from not giving a shit about identifying people. As long as you look old enough, or choose enough to old enough, you can buy some. I'll strongly express that not every place is like this, but there's a nontrivial number that are.

If you take that same approach with everything, you get corpos just eating EPA fines for polluting that are a fraction of what they would need to spend to properly dispose of their industrial waste. There's probably thousands of examples, but I won't waste everyone's time to dig them up and cite them.

He was the perfect embodiment of this profit-first mentality. Easily one of the best ferengis in any of the trek universe.