Is it safe? Is it profitable? What is the best method of transaction?

I have been seriously considering selling items through facebook or sulit. I plan to sell make up, nail polish and other personal care products. I figured I should start with items that are my interest.

As an example, the nail polish that I plan to sell would cost me P150 to P200 in the US and plan to sell it for P300. It sells for P350 at the mall but I see sellers from sulit selling it at P300, P350 and P500. It costs USD65 to ship a box from the US to Manila so I am thinking is a 100 to 150% mark up enough for me to make money? But I am surprised that people are buying it for more that the cost at the mall! The problem is I feel guilty to have such a high mark up. I have never really tried selling stuff in my entire life since I am bad at singilan and I feel guilty to mark up with my friends One example of what I thought was a high mark up would be the Cookie Butter which sells for less than USD4 but sold here for P450. But then when I calculated it, assuming that it is shipped for USD65, the mark up isn't as immoral as I previously thought SO better na to sell online so no guilt for me.

What I want to find out is if it is worth the trouble to sell online? What are the usual challenges of selling online?

I'm a regular at a monthly bazaar in Manila and I know some sellers that only started with buying stuff in the US and selling it on bazaars. Now most of them have brick and mortar shops already! I used to go direct to their houses so I get first dibs and no crowd but now I just go to their stores. Galing nga e