Modern notes ENDING in four or more 0s or four or more 9s for that matter are actually quite rare to find. Much rarer than any with the same amount of leading zeroes. The reason is that they are nearly always pulled out of the straps of printed notes and replaced with star notes. For example if you have a bundle of 1000 notes that say begins with serial D01239001A, it would then typically end in serial D01240000A. However, the last two notes, D01239999A and D01240000A will be removed, destroyed, and replaced with a pre-printed star note (usually from a low print run). This is done for various reasons, sometimes for testing purposes, to make sure the serials line up properly, etc. However the main reason is that the serial number rollers are a bit finicky when you approach a rollover. Sometimes they won't line up properly and the serials look like how a car's odometer looks when it rolls over to 10000 miles. The 9s and 0s will sometimes not fully turn or do a 7/8th turn or something to that effect. It's just easier for the BEP to pull those rollover notes before they are released and replace with a star note and that is what is done 99+% of the time.
Now for collector value, the lower the serial the better typically however I personally have never even seen a *modern* FRN note with four ending zeroes. I have seen a 2004A $20 w/ 4 ending 9s though.