it's a good question. to give some insight from my perspective:
1. keeping legacy, carving in stone, carving in a tree your love letters are human things that are always wanted. this service is by far the best way i know to keep your words forever. because its in the bitcoin blockchain, it should be longer than keeping a google sheet, an external storage device, a website or amazon s3 in the cloud.
2. i have looked at the blockchain and sampled 1000's of entries before i built this and i can see people have written at the 80 characters or less and seen important date updates, opinions, a lot of memorials, promotion of ideas and websites and many more so it is being used.
3. the question of $49 is a good question which needs to be tested. my assumptions are: a. there is cost for run this business, pay a miner fee and verify these messages plus the business needs to make some money.
b. it might be that the price should be a little lower but not sure yet.
c. it is a service. if it solves your problem, gives you a better option. d. saves you time to do it yourself, people will pay for it. (people even pay for others to wait in line for them for the newest iphone). it's about the value you get and whats its worth for you.
4. this site is v0.1 and future we can enable more than 80 characters but have not implemented this yet.
