As Canuck really did not make an effort to answer your questions and instead told you his honest opinion I will pitch in here - as you are relatively new to OF.
Fast beat movements was a way to make the watches more accurate. At the same time the hi beat made serviceing intervals more important and using the correct lubricants at the right places even more important than on slower beat movements.
Eterna-matics have a cult following and/but is not one of the big brands. Value monetary wise is not high. Mixing up monetary value with collectabillity is a difficult thing. I believe any vintage hi beat day-date with a striking design is a collectable. The watch in the picture looks like an honest piece polish wise and that dial sparkles. Dial and crown seems to be original and I hope the bracelet is too. Cushion shaped cases are a binary thing - you either love them or hate them. I love them. Kon-tiki is a known part of Eternas brand and I guess they will always be more popular.
In short - If talking about the watch in the picture - I believe it is worth to collect. Price is up to you. Do you like its design - go for it.