After Harry was gifted a Firebolt by his godfather Sirius Black, why didn't Draco Malfoy buy a Firebolt, seeing as he bought a Nimbus 2001 after seeing Harry with his Nimbus 2000.
Well, I think you've answered your own question, really, if you don't mind my saying so. He bought a Nimbus 2001 after seeing Harry's Nimbus 2000.
He doesn't want the same broom as Harry, certainly, he has to one-up him, doesn't he? Remember when McGonagall confiscated Harry's Firebolt, and Wood tried to get it back, but failed? Harry and Wood has this conversation:
'I reckon it's time you ordered a new broom, Harry. There's an order form at the back of Which Broomstick ... you could get a Nimbus Two Thousand and One, like Malfoy's got.'
'I'm not buying anything Malfoy thinks is good,' said Harry flatly.
Harry Potter and the Prisoner of Azkaban - p.181 - Bloomsbury - chapter 12, The Patronus
I'd say Malfoy's mind would work more or less the same way, don't you think? He isn't buying any broomstick Harry Potter thinks is good.
Of course, I'm sure he'd have liked a comparable broomstick of his own, if he could've had one. But a Firebolt is an international-standard broomstick. And I'm not sure even Lucius Malfoy is going to shell out for another (this time, even more preposterously expensive) broomstick for his son, just one year later. Think back to The Chamber of Secrets:
Malfoy, who had reached for the glass eye, said, 'I thought you were going to buy me a present.'
'I said I would buy you a racing broom,' said his father, drumming his fingers on the counter.
'What's the good of that if I'm not in the house team?' said Malfoy, looking sulky and bad-tempered. 'Harry Potter got a Nimbus Two Thousand last year. Special permission from Dumbledore so he could play for Gryffindor. He's not even that good, it's just because he's famous ... famous for having a stupid scar on his forehead ...'
Malfoy bent down to examine a shelf full of skulls.
'... everyone thinks he's so smart, wonderful Potter with his scar and his broomstick -'
'You have told me this at least a dozen times already,' said Mr Malfoy, with a quelling look at his son ...
Harry Potter and the Chamber of Secrets - pp.42-3 - Bloomsbury - chapter 4, At Flourish and Blotts
I'd say Lucius Malfoy is getting a bit tired of all this, wouldn't you?
And then again:
'I hope my son will amount to more than a thief or a plunderer, Borgin,' said Mr Malfoy coldly and Mr Borgin said quickly, 'No offence, sir, no offence meant -'
'Though if his school marks don't pick up,' said Mr Malfoy, more coldly still, 'that may indeed be all he is fit for.'
Harry Potter and the Chamber of Secrets - p.44 - Bloomsbury - chapter 4, At Flourish and Blotts
I don't think he's going to be bought another brand new broomstick, especially not an international-standard one.
And, anyway, don't you think it's admitting defeat a bit? Harry Potter gets a Nimbus Two Thousand, Malfoy gets the entire Slytherin team Nimbus Two Thousand and Ones and then, one year later, he has to buy himself another new stick, because his suddenly isn't big enough anymore.