At the price you're selling and the relatively nondescript script, I'd say it's not worth it. We've all seen the cheap dice sites copied off the same old scripts turn up here and inevitably die off. We've also seen whitelabels from the slot empires try and launch as Bitcoin casinos - their lack of provably fair features coupled with dubious slot jackpots and worthless jurisdiction guarantees they don't last.
You might want to check out the most popular dice sites. BitDice, Bitsler, 999Dice, Crypto-Games, PrimeDice, to name a few. They look similar at first glance but each is pretty unique. Some have lower edges than others, some have very high (and low) winning chances for those who like the chance to win > x9k payouts. Others add investment features.
Innovate. That's the only way to compete.
nobody is buying your script/website because people who are interested in starting a new dice gambling site are two kinds:
1. those who want to create something cheap with not much investment.
they will look for free scripts, I have even seen free hosting and domains be used by these people. they don't want to spend any money if possible so they are not going to buy a website script from someone else at a high price that you are offering.
2. those who want to create something big and make real money from it.
this group which consists of a small portion of people out there, want to start a successful business and make real money from it. something like the big dice sites these days.
they will not want a script from you. they will have their own team of developers and experts designing something good to be successful.
This is the most accurate representation of people interested in starting new dice sites. Your best hope at the moment, if you really want to make an income from coding, is to seek out people from #2.