Most women are not interested in investing and they are very good at saving money. The $ 10 bitcoin in coinbase wallets is a small amount of money and they have nothing to do with it. Too few places accept bitcoin to spend that money. In terms of knowledge of cryptocurrencies and technology, they are also inferior to men. As is the case today, many women own smartphones but most of them only listen to music, go to Facebook and take photos. They are more conservative and less curious than our men, so it's no surprise they don't care about cryptocurrencies. If Coinbase is an interesting app like facebook or instagram, they might remember that they have $ 10.