I have been in VisaJourney long enough to know that a LOT of K1 cases end up poorly - from the ones that are processed super fast to the ones that take years. I see three problems with your argument:
1. Video chatting and meeting every now and then for two years is very, very different from living together, sharing bills, problems, priorities, cultural differences, spending time with relatives you might or might not like, and other routine grievances. So, choosing a K1 to spend more time doing long distance does very little to tell you how successful married life will be with that person.
2. The idea that a scammer would not be willing to wait two years to scam for a green card is wishful thinking at best. Time and again we see stories of people that do a complete 180 when they set foot in the US after YEARS of relationship, fiance visa and spousal visa alike.
3. The K-1 is financially problematic, perhaps not for you, but for many that overlook the real costs of having to adjust status. It's not just the fees, but living on one income for an extended period of time, the draining of savings and the inability to get a DL or to travel abroad for a family emergency, for example. All of those can really strain a relationship - a quick search here on VJ will confirm that.
Sure, each person has their own priorities but there is nothing intrinsically good about a K1 visa. It does not bind you into marriage until it's issued, sure, but it does not give you any predictor of what marriage life will be like either. That's the risk one chooses to take when entering an international long-distance relationship. No marriage comes with guarantees, not even local ones, so choosing a K1 just "to be sure" you're going to last is not an option I would recommend, for the reasons I mentioned above.