App pricing, how much?

Question

Android

The application is a reference book and a bunch of calculators, respectively, after payment, advertising disappears and new sections open.

So, it will be normal for you to pay
10 rubles a month / 100 years
20 rubles a month / 200 years
30 rubles a month / 300 years
Or a one-time 500 rubles.

If possible, throw a link to the applications for which you paid and a description of why you paid.
Thanks in advance.

The application itself is a directory of 1000+ positions, an offline version, several 10 calculators and more.

Answer 1

If I need it, I pay 300 a month calmly. And I don’t need it and I won’t pay a ruble.
For example, I pay for YouTube, what it gives you can read on their website.
Sometimes I pay 500 rubles for toys to pass the time sitting on the toilet.
And why should I pay for reference books and calculators I don’t know.