I understand your feelings, everyone needs to bin pet because much can do with it in their Nest like keeping it health by feeding, given a bowl as the bed. Teaching your pet so have skill such as understand the 'sit' and 'stay', spinning tricks, ball skill with juggling and to throw a ball command.
In addition you also need to pay attention of pet status ranging from energy, food, health until fitness. Like all pets, they also needs a rest when tired after playing so give it enough sleep.
In this game there is little in common with Moshi Monsters to collect small creatures namely moshlings.
The conclusion 25 DOSH too small you should just Bin Tycoon to get more DOSH each month or you can get binweevils dosh coins without become Bin Tycoon by an instant Dosh Top-Up Package from Shopping Mall -> beside right of Bin Mart.
But I heared the quote was posted is Official Bin Weevils Magazine Issue #5 from Bunty’s Bin Secrets on Pages 28 -29:
“Soon, you’ll be able to exchange your Dosh Coins for Mulch, or exchange your Mulch savings for Dosh! All Bin Weevils will be able to do this whether you are a Bin Tycoon or not.”Hopefully it's become true as we know it is easier to get Mulch one I've described on page Binweevils Cheats for Mulch, I think it's very clear for you to do.