While it is not uncommon for points to accrue on the principal cardholder's account when supplementary cardholders make eligible spend, it is quite rare for banks to allow cardholders to transfer points between two parties (especially when they are not directly related). Even though the benefits from the ANZ Travel Visa Signature Credit Card have been diluted over the years, it is still a pretty decent card to have when you consider everything else. Paying S$200 a year for 10,000 bonus Travel$ (which converts into 10,000 miles) is not necessarily a bad idea so long you know how to use your miles wisely. What a lot of people do not realise however is that it is actually possible to transfer your Travel$ to another ANZ Travel Visa Signature Credit Principal Cardholder.
Transfers have to be done in blocks of 1,800 Travel$ (which translates into 1,800 miles) and 700 Travel$ will be deducted from every transfer (think about this as an administrative charge). Obviously transferring Travel$ is not something everyone should aspire towards but if you are going to end up doing something really silly (e.g. redeeming on Economy to the US), you might be better off transferring these miles away instead.
Miles are worth S$10 per 1,000 on Singapore Airlines when you offset the cash component of your fare. On the black market, they generally fetch around S$20 per 1,000 but if you use them efficiently, it is not uncommon to see them valued at S$60 to S$90. One important thing to note however is that "selling" of Travel$ or miles is never allowed - it is a little bit of a grey area but I do not encourage such behaviour. Seriously, just save up for a nice Business Class trip on the Singapore Airlines' 777-300ER instead.