PHEVs (hybrids with large battery packs) are the worst of both worlds -- weight penalty of a big EV pack, but the complexity/maintenance of an ICE engine. Additionally, rarely used gas can go bad sitting in the tank. Just get a regular hybrid if you're concerned about EV range or don't like the current limited offerings.
It's not as easy as more components = more expensive.
The battery pack is much smaller. A Prius PHEV is almost 500 lbs lighter than a Model 3 and only 100 lbs heavier than a normal hybrid Prius, which also has a battery pack. The MSRP is lower by almost $10k, which can cover a lot of maintenance before you resell it with less depreciation.
