If my contribution is more than 0.1 eth... then do I get any benefit? And yes, I know that its not too much, but still
Yes, why not? Your benefit is value in percents, so youll get your percents. For example, the benefit is 50%. You can get $1 or $1000. It all depends on your investment.
Fully agree, and the dependence is high. You also can get huge bonus (during pre-ICO for example) or invest more than $10k to benefit a lot. Always theres special discounts for big investments.