Some people always think bitcoin is expensive but it is not. For instance if 1 bitcoin is = $10,000 we will say it is too expensive and when we look at the price in next two years it can be double($20,000-$30,000) and we realize that bitcoin at $10,000 was very cheap and something very affordable. The future will always make us understand that bitcoin is not expensive, we only miss expensive opportunities that we won't be able to get back.
You should always have a positive plan to invest in Bitcoin as we have seen that the price of Bitcoin was very low at one time, and it has become very valuable now. When the price of bitcoin increases and lots are expensive, we feel that we were better off investing when the price of bitcoin was low, but we missed the opportunity. So it is best to invest this precious currency over time, and we know that Bitcoin will increase in value more after few years. In that case we should invest in Bitcoin and hold it because the value of this Bitcoin will be more valuable in the future, in which case it is best if we invest and hold Bitcoin.