
That really not true at all.
If you have 10 shares of Apple stock at $100 a share ($1000 total)
or
If you have 100 shares of Starbucks at $10 a share ($1000 total)
If either stock goes up 5%, 10%, 20%, etc you make the same amount of money in both situations ($50, $100, $200)
The price of a stock should not factor in your decision to buy it. It is merely a numerical representation for the amount one share contributes to the value of a particular company. (Market Cap/Shares Outstanding = PPS)
Starbucks, for example, is an 8.2 billion dollar company right now whether it has 730 million shares of outstanding stock or 730,000. In the latter scenario, the company would still be worth 8.2 billion dollars, but the price per share of stock would be $11,232 with the same likelihood of going up 5% as when the stock is worth $11 pps because all the fundamental financials have not changed.