No mate, there's nothing strange about it . Here are the reasons I think of:

1. Many use it over the alts simply because it is the most popular crypto. Most new users knew it first before any alts available.
2. In the eyes of investors/buyers & sellers this is the best option they think of. They are comfortable to use the Rank 1 rather than Rank N coin.
3. Not all of people know that Ethereum got a lower fees, Monero offers more security etc. That's why they use btc.