You can't compare someone like Rijk who has a full time job to other founders who can work on their projects full time. Bitvavo listing will change the course for Gulden and with a higher stable price Rijk can quit his job and put effort into Gulden.
What price is needed for Rijk to quit his job and put 100% effort into Gulden?
Don't quote me but from what I remember on slack when the reward change was discussed. +- €0.04c and the development team can be permanently on Gulden, including Rijk.
https://www.coingecko.com/en/coins/gulden/eur Current rate is 0.014, a stable price of 2.8 times more then current price and the outlook for Gulden changes drastically. I would like to see Rijk given the chance to go conferences, promote gulden on podcasts, popular youtube channels etc.
I personally think €0.04c is not a unrealistic stable price, from my own experience working 48 hours a week it would be hard to compete with coins where the founders have the financial resources to work on their coins 24/7. Respect to Rijk for having full time employment and working on Gulden in his free time.