It is just how much i choose to sell it, that why i give full source code for audit and inspection.
Why not hire some reputable pentester and a full stack developer from Upwork etc and let them speak for your script? If your script turns out to be "secure". You could easily get 10x the amount you are asking for...
Thanks man i already gave external full stake developers and security audit firm to check it and it came out right , and i still keep improving on it . Soon i will increase the price just like you said .