Congratulations for finding a R014/RC, ringo34.
Yes, there are collectors for all kinds of things, including Euro banknotes of rare plates.
It looks like R014/RC

are not that easy to sell for the right price though (except maybe directly to collectors).
On Delcampe, there's a "circulated" one for sale since 2025-02-21, for 75€, still no offers. The last ones sold there were:
- AU 2023-11-23 65€ (but the seller didn't stress out that it was RC, so I think they didn't know of its rarity; also, it took more than 6 months to finally find a buyer)
- UNC 2023-01-12 100€
- AU 2020-02-22 95€
On Aukro (Czechia), a 5/10 one was offered for 65€, and it ended on 2021-11-16 with no bid.
Berriot claims it to be 222€ if UNC A1; yours (XF = 7/10, not A1) would be 145€. Sohier quotes it 180€ (again, UNC). Taking into account its relative rarity, they might both be close to fair prices — but maybe there aren't enough collectors interested. With no buyers, rarities are worthless.
I only know of R014/RC

in the range RC0030 to RC0069. If it turns out to be the sole RC range for R014, then it's not 6 million but only 4 Million. ⁽¹⁾ (But there are ranges that didn't surface yet, so Sohier's estimate of 6,5 M might be right.) In any case, it's
not one of those really rare combos with less than 1M printed.
I would save it, nevertheless. In fact, I have found 9 of those so far, and I saved 5 of them, a A1 and the other four probably XF like yours.
_________
⁽¹⁾ To be precise, it's 740 cycles of 100 sheets of 54 banknotes each, so 3.996M banknotes.