I’d lean more toward people being bias toward round numbers or round share %.
Here’s some percentages:
13% invested the minimum £10
16% of pledgers were able to invest
26% invested the full £1000
34% invested up to the equivalent of equal share investment (£60)
36% invested £500+
49% invested <= £100
51% reinvested
60% invested £250 or less
The five highest chosen amounts were £1000, £100, £10, £50 & £500 making 71% of investments.