It's a relative thing. Margins for crossovers are higher than for passenger cars because you can sell effectively the same thing (in terms of raw materials and R&D) for more money. It's not profiteering though so much as improving what can be pretty lousy margins on regular cars.
The average car today is about the same price, inflation adjusted, as its equivalent quarter of a century ago. But they're more expensive to produce, for myriad reasons - labour costs, materials costs, the expense of meeting legislation etc. It's very, very difficult to make money on smaller cars particularly, because stuff like R&D is no cheaper than it is for much bigger cars sold for more money, and in terms of basic materials and production expenses they're closer to those big cars than they are to being free.
A Volkswagen Up, for instance, is less than half the price of a VW Golf over here in Europe, but in pure weight terms (a simplistic but reasonably easy to measure metric for how much physical stuff has gone into making the car) it's maybe only a quarter less. So in very basic terms, VW only has to spend a third more to make a Golf than it does an Up, but can sell it for twice the price. And then it can go and sell a Golf R, which is an even smaller step over a basic Golf in terms of costs, for twice as much again (or four times the revenue than selling an Up, but maybe only 50% extra in costs). Or it can sell whatever the Golf crossover is for maybe 15% more than a Golf for again, a minimal increase in costs.
Now the margins on even a basic Golf are probably quite slim, so that extra 15% is quite valuable to a big carmaker. It probably means there's very little risk of one company suddenly chopping 15% off its crossover to gain market share either, because it'd mean taking a significant revenue hit.
For Ford, this decision is probably quite an easy one. It can sell an Ecosport or whatever for a good few thousand more than a Fiesta, but spend no more actually developing or producing it (given the Ecosport was designed for and engineered in third-world markets, it could well be significantly less expensive to develop and produce than a Fiesta).
The trouble comes if there's suddenly a paradigm shift away from crossovers in the US. A big hike in the price of gas, a tax based on size or weight, something that encourages people to buy something smaller and cheaper to buy and run. If Ford literally doesn't have anything smaller or cheaper to run for customers to buy, that could be problematic.