Now let's talk about the most interesting part — money. How much will promotion cost, how much will each subscriber cost, and how much should you spend?
The answer is simple — you need to test and see the results. It all depends on the channel's topic, competition in it, and the effectiveness of advertising posts. From our own experience, we can say that simply changing an advertising post can change the cost per subscriber by more than 10 times! More specifically, in Telegram, the cost of advertising placement is calculated per 1000 views (CPM — cost per mille). For example:
On average, a post in the channel reaches 30,000 views within 24 hours. The cost of 1000 views in this channel (CPM) is 100 UAH. Therefore, the cost of placement in this channel will be 30,000 / 1000 * 100 = 3,000 UAH.
If from this placement you gained 700 subscribers, then the cost of 1 subscriber will be 3,000 / 700 = 4.28 UAH.