What if I pay 33% of a .03 loan up front?
Then that means you could run off with the other 66% and then the better question is, why then ask for .03 BTC if you only need .02BTC as you already have .01, or why ask for a .03 BTC loan in the first place? The way collateral works, is you have to be able to send people something of value that can be used to recoup their losses if the person taking the loan defaults. For example, if you wanted a 2 BTC loan, you would have no problem getting that loan if you provided something worth 2.5BTC as collateral, that the person giving you the loan could sell to get their coins back if you defaulted.
ID and partial payments don't mean anything anymore, after people realized they were still getting scammed with people's full IDs. Going to court over a defaulted loan with someone across the country or in a different country over a Bitcoin loan made on an internet forum doesn't have the greatest chance of being awarded, so the only safe way to do loans now is with collateral. Now, if you have used the forum for a year or two, and you are looking for a .03 BTC loan, someone might give it to you based on the hope that your time spent building your account off is worth more than $4, however reputation based loans are never for any more than a few dollars, and taking loans solely to build your reputation is viewed as a scammer's activity.
So my advice to you, only request a loan that you actually need. Only request it if you have some form of collateral lined up, and be aware, if you don't have a valid reason for requesting the loan, valid collateral, and anything but an incredibly believable story, you can expect to be labeled a scammer immediately. Its not always fair, but thats how the forums have adapted to deal with people who are anonymous using an unreversable payment method.
Some frequent collateral mediums are: Litecoins (talk to TomatoCage) Virtual shares in companies like ASICminer, and anything of value that you can send to someone in the mail.