Bob buys Dash with ten bitcoins at a rate of 400 Dash per bitcoin. He has 4000 Dash. He sets up 4 masternodes that make him 75 Dash per masternode per year (300 Dash per year total). In three years, he now has 900 Dash from his masternode yield. Because he feels the ratio of bitcoin-to-Dash is favorable in three years, he takes all of his masternode yield he's collected and swaps back to bitcoin. He now has 90 bitcoins.
Bob has 4000 Dash in masternodes and is still earning Dash every year.
Bob has 90 bitcoins, getting back 80 bitcoins extra from his 10 bitcoin risk.
Result: Bob has 4000 Dash and 90 bitcoins.
Sarah is a bitcoin HODLer. She holds 10 bitcoins for three years. She doesn't buy Dash. In three years, she has 10 bitcoins and 0 Dash.
Result: Sarah has 10 bitcoins and 0 Dash.